build & link with luajit instead of lua5.1

author: sanine <sanine.not@pm.me> 2023-03-11 15:58:20 -0600
committer: sanine <sanine.not@pm.me> 2023-03-11 15:58:20 -0600
commit: ebc50b387ab209c9f9a0d92e340ac293d5697274 (patch)
tree: ea8c8b3677a18c994d2b9d33dbef3461dcf18113 /libs/luajit-cmake/luajit/doc/ext_jit.html
parent: c2329b4c8258baa9429c77566c9def97d00e96d7 (diff)
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+<!DOCTYPE html>
+<html>
+<head>
+<title>jit.* Library</title>
+<meta charset="utf-8">
+<meta name="Copyright" content="Copyright (C) 2005-2022">
+<meta name="Language" content="en">
+<link rel="stylesheet" type="text/css" href="bluequad.css" media="screen">
+<link rel="stylesheet" type="text/css" href="bluequad-print.css" media="print">
+</head>
+<body>
+<div id="site">
+<a href="https://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
+</div>
+<div id="head">
+<h1><tt>jit.*</tt> Library</h1>
+</div>
+<div id="nav">
+<ul><li>
+<a href="luajit.html">LuaJIT</a>
+<ul><li>
+<a href="https://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
+</li><li>
+<a href="install.html">Installation</a>
+</li><li>
+<a href="running.html">Running</a>
+</li></ul>
+</li><li>
+<a href="extensions.html">Extensions</a>
+<ul><li>
+<a href="ext_ffi.html">FFI Library</a>
+<ul><li>
+<a href="ext_ffi_tutorial.html">FFI Tutorial</a>
+</li><li>
+<a href="ext_ffi_api.html">ffi.* API</a>
+</li><li>
+<a href="ext_ffi_semantics.html">FFI Semantics</a>
+</li></ul>
+</li><li>
+<a href="ext_buffer.html">String Buffers</a>
+</li><li>
+<a class="current" href="ext_jit.html">jit.* Library</a>
+</li><li>
+<a href="ext_c_api.html">Lua/C API</a>
+</li><li>
+<a href="ext_profiler.html">Profiler</a>
+</li></ul>
+</li><li>
+<a href="status.html">Status</a>
+</li><li>
+<a href="faq.html">FAQ</a>
+</li><li>
+<a href="https://luajit.org/list.html">Mailing List <span class="ext">&raquo;</span></a>
+</li></ul>
+</div>
+<div id="main">
+<p>
+The functions in this built-in module control the behavior of the JIT
+compiler engine. Note that JIT-compilation is fully automatic &mdash;
+you probably won't need to use any of the following functions unless
+you have special needs.
+</p>
+
+<h3 id="jit_onoff"><tt>jit.on()<br>
+jit.off()</tt></h3>
+<p>
+Turns the whole JIT compiler on (default) or off.
+</p>
+<p>
+These functions are typically used with the command line options
+<tt>-j on</tt> or <tt>-j off</tt>.
+</p>
+
+<h3 id="jit_flush"><tt>jit.flush()</tt></h3>
+<p>
+Flushes the whole cache of compiled code.
+</p>
+
+<h3 id="jit_onoff_func"><tt>jit.on(func|true [,true|false])<br>
+jit.off(func|true [,true|false])<br>
+jit.flush(func|true [,true|false])</tt></h3>
+<p>
+<tt>jit.on</tt> enables JIT compilation for a Lua function (this is
+the default).
+</p>
+<p>
+<tt>jit.off</tt> disables JIT compilation for a Lua function and
+flushes any already compiled code from the code cache.
+</p>
+<p>
+<tt>jit.flush</tt> flushes the code, but doesn't affect the
+enable/disable status.
+</p>
+<p>
+The current function, i.e. the Lua function calling this library
+function, can also be specified by passing <tt>true</tt> as the first
+argument.
+</p>
+<p>
+If the second argument is <tt>true</tt>, JIT compilation is also
+enabled, disabled or flushed recursively for all sub-functions of a
+function. With <tt>false</tt> only the sub-functions are affected.
+</p>
+<p>
+The <tt>jit.on</tt> and <tt>jit.off</tt> functions only set a flag
+which is checked when the function is about to be compiled. They do
+not trigger immediate compilation.
+</p>
+<p>
+Typical usage is <tt>jit.off(true, true)</tt> in the main chunk
+of a module to turn off JIT compilation for the whole module for
+debugging purposes.
+</p>
+
+<h3 id="jit_flush_tr"><tt>jit.flush(tr)</tt></h3>
+<p>
+Flushes the root trace, specified by its number, and all of its side
+traces from the cache. The code for the trace will be retained as long
+as there are any other traces which link to it.
+</p>
+
+<h3 id="jit_status"><tt>status, ... = jit.status()</tt></h3>
+<p>
+Returns the current status of the JIT compiler. The first result is
+either <tt>true</tt> or <tt>false</tt> if the JIT compiler is turned
+on or off. The remaining results are strings for CPU-specific features
+and enabled optimizations.
+</p>
+
+<h3 id="jit_version"><tt>jit.version</tt></h3>
+<p>
+Contains the LuaJIT version string.
+</p>
+
+<h3 id="jit_version_num"><tt>jit.version_num</tt></h3>
+<p>
+Contains the version number of the LuaJIT core. Version xx.yy.zz
+is represented by the decimal number xxyyzz.
+</p>
+
+<h3 id="jit_os"><tt>jit.os</tt></h3>
+<p>
+Contains the target OS name:
+"Windows", "Linux", "OSX", "BSD", "POSIX" or "Other".
+</p>
+
+<h3 id="jit_arch"><tt>jit.arch</tt></h3>
+<p>
+Contains the target architecture name:
+"x86", "x64", "arm", "arm64", "arm64be", "ppc", "mips", "mipsel", "mips64", "mips64el", "mips64r6", "mips64r6el".
+</p>
+
+<h2 id="jit_opt"><tt>jit.opt.*</tt> &mdash; JIT compiler optimization control</h2>
+<p>
+This submodule provides the backend for the <tt>-O</tt> command line
+option.
+</p>
+<p>
+You can also use it programmatically, e.g.:
+</p>
+<pre class="code">
+jit.opt.start(2) -- same as -O2
+jit.opt.start("-dce")
+jit.opt.start("hotloop=10", "hotexit=2")
+</pre>
+<p>
+Unlike in LuaJIT 1.x, the module is built-in and
+<b>optimization is turned on by default!</b>
+It's no longer necessary to run <tt>require("jit.opt").start()</tt>,
+which was one of the ways to enable optimization.
+</p>
+
+<h2 id="jit_util"><tt>jit.util.*</tt> &mdash; JIT compiler introspection</h2>
+<p>
+This submodule holds functions to introspect the bytecode, generated
+traces, the IR and the generated machine code. The functionality
+provided by this module is still in flux and therefore undocumented.
+</p>
+<p>
+The debug modules <tt>-jbc</tt>, <tt>-jv</tt> and <tt>-jdump</tt> make
+extensive use of these functions. Please check out their source code,
+if you want to know more.
+</p>
+<br class="flush">
+</div>
+<div id="foot">
+<hr class="hide">
+Copyright &copy; 2005-2022
+<span class="noprint">
+&middot;
+<a href="contact.html">Contact</a>
+</span>
+</div>
+</body>
+</html>
author	sanine <sanine.not@pm.me>	2023-03-11 15:58:20 -0600
committer	sanine <sanine.not@pm.me>	2023-03-11 15:58:20 -0600
commit	ebc50b387ab209c9f9a0d92e340ac293d5697274 (patch)
tree	ea8c8b3677a18c994d2b9d33dbef3461dcf18113 /libs/luajit-cmake/luajit/doc/ext_jit.html
parent	c2329b4c8258baa9429c77566c9def97d00e96d7 (diff)